Disable IPv6¶

Red Hat-based system¶

# As root
sysctl -w net.ipv6.conf.all.disable_ipv6=1
sysctl -w net.ipv6.conf.default.disable_ipv6=1

# re-enable IPv6
sysctl -w net.ipv6.conf.all.disable_ipv6=0
sysctl -w net.ipv6.conf.default.disable_ipv6=0

Debian-based system¶

vi /etc/sysctl.conf

Add at the bottom of the file:

net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1

Reboot the machine:

shutdown -r now

To re-enable IPv6, remove the above lines from /etc/sysctl.conf and reboot the machine.